Influence of the vibrational modes from the organic moieties in 2D lead halides on excitonic recombination and phase transition

Autor: Moral, Raphael Fernando, 1990, Germino, José Carlos, 1990, Bonato, Luiz Gustavo, 1987, Almeida, Diogo Burigo, 1983, Atvars, Teresa Dib Zambon, 1952, Silva, René Alfonso Nome, 1977, Nogueira, Ana Flávia, 1973
Přispěvatelé: UNIVERSIDADE ESTADUAL DE CAMPINAS
Rok vydání: 2020
Předmět:
Zdroj: Repositório da Produção Científica e Intelectual da Unicamp
Universidade Estadual de Campinas (UNICAMP)
instacron:UNICAMP
Repositório Institucional da Unicamp
Popis: Agradecimentos: R.F.M. acknowledges the support from FAPESP—process number: 2019/25765-6. A.F.N., J.C.G., and R.F.M. gratefully acknowledge support from FAPESP (the Sao Paulo Research Foundation, Process 2017/11986-5), Shell, and the strategic importance of the support given by ANP (Brazil's National Oil, Natural Gas, and Biofuels Agency) through the R&D levy regulation. S.D.S. acknowledges the Royal Society and Tata Group (UF150033). D.B.A. thanks the support of CAPES and FAPESP (process 2019/22576-8). T.D.Z.A. acknowledges the support from FAPESP—process number: 2013/16245-2. The authors also thank Prof. Alexandre Marletta, from Federal University of Uberlândia, for kindly allowing the authors to measure temperature-dependent PL of the thin films in his laboratory Abstract: 2D metal halide semiconductors have been intensively studied in the past few years due to their unique optical properties and potential for new-generation photonic devices. Despite the large number of recent works, this class of materials is still in need of further understanding due to their complex structural and optical characteristics. In this work, a molecular-level explanation for the dual band emission in the 2D (C4H9NH3)(2)PbI4 in its bulk form is presented, demonstrating that this feature is caused by a strong exciton-phonon coupling. Temperature-dependent photoluminescence with Raman and IR spectroscopies reveals that vibrations involving the C-NH3+ butylammonium polar head are responsible for this exciton-phonon coupling. Additionally, experimental shifts in the mean phonon frequencies coupled with the electronic excitation, combined with a theoretical model, show that these vibrational modes present a soft-mode behavior in the phase transition of this material FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO - FAPESP COORDENAÇÃO DE APERFEIÇOAMENTO DE PESSOAL DE NÍVEL SUPERIOR - CAPES fechado
Databáze: OpenAIRE
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